6440072 has 16 divisors (see below), whose sum is σ = 12402060. Its totient is φ = 3132864.

The previous prime is 6440041. The next prime is 6440089. The reversal of 6440072 is 2700446.

It can be written as a sum of positive squares in 2 ways, for example, as 5080516 + 1359556 = 2254^2 + 1166^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10583 + ... + 11174.

Almost surely, 2^6440072 is an apocalyptic number.

It is an amenable number.

6440072 is a deficient number, since it is larger than the sum of its proper divisors (5961988).

6440072 is a wasteful number, since it uses less digits than its factorization.

6440072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21800 (or 21796 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 6440072 is about 2537.7296940376. The cubic root of 6440072 is about 186.0502427188.

The spelling of 6440072 in words is "six million, four hundred forty thousand, seventy-two".